Finance and Payment Systems

Most of the finance systems we build come down to recording accurately where money comes from and where it goes. Typical work includes subscriptions and recurring billing, marketplace payments split between sellers, wallet and balance systems, refund flows, and automatic reconciliation against payment provider records. Payments are taken through Stripe, iyzico or crypto payment rails, and card data is processed without ever being stored on your own servers.

The admin and reporting dashboards that sit on top of these systems are part of the job too. We build dashboards that show daily revenue, pending and failed charges, refunds and currency differences on one screen, with role-based access. We also automate the exports and period-end reports your accounting team needs, so nobody has to merge spreadsheets by hand at the end of the month.

We build crypto trading bots and automations on the APIs of exchanges such as Binance, Bybit and Kraken, following the strategy rules you define. Using Python and the ccxt library we connect to several exchanges through one codebase, take price data from WebSocket streams, and record orders, positions and balances in PostgreSQL. The strategy comes from you; we turn it into software that can be tested and observed.

A strategy that looks good on historical data will not necessarily make money in the future, so we do not promise profits and we do not give investment advice. What we do is backtest your strategy on historical data first, then let you run it on exchange testnets or with small amounts under live conditions. Fees, slippage and partial fills are modelled in the tests so results reflect real market behaviour.

In an automated finance system, the most important code is the code that runs when things go wrong. Order and position size limits, a daily loss limit, a kill switch that stops all trading in one step, and safe behaviour when the exchange connection drops are defined up front on every project. Before an order reaches the exchange it passes balance, limit and price sanity checks.

API keys are used with only the permissions they need, with withdrawals disabled and IP restrictions where the exchange supports them, and are stored encrypted. In payment systems we verify webhook signatures, make sure the same payment is never processed twice, and store amounts in exact decimal types that avoid rounding errors. Every transaction is kept as an append-only record, and critical events trigger instant alerts by Telegram or email.

We begin by writing your process and rules down: which payment provider to use, when a refund is issued, under which conditions a trading bot opens or closes a position. That document becomes the basis for both development and testing. Development happens against sandbox and testnet environments, never real money, and we review progress with you at weekly milestones.

Going live is gradual. The system first runs with low limits or a small group of users, and limits are raised only after we have watched the logs and alerts together. You own the source code and the server access, and we recommend keeping API keys on a server you control. After launch we support you with maintenance for exchange and payment provider API changes and new features.